Inductance-coil attachment



' May 31, 1927g 1,630,903

H. B. PEARSON INDUCTANCE COIL ATTACHMENT H. B. PEARSQN INDUCTANCE COILATTACHMENT May 31, 1927. 1,630,903

Filed Jan. 28. 1922 5 Sheets-Sheet 2 1,630,903 May 3l, l927- H, B,PEARSON l INDUCTANCE COIL ATTACHMENT Filed Jan. 28. 1922 5 Sheets-Sheet3 L n f ATTORNEYS. myn? Patented May 31, 1927.

UNITED STATES PATENT OFFICE.

HERBERT BROV/'N PEARSON, OF BROOKLYN, NEW YORK, ASSGNOR TO SHIP OWNERSRADIO SERVICE, ING., OF NEW YORK, N. Y., CORPORATION OF WASHING-TON.

INDUCTANCE-COIL ATTACHMENT.

Application filed January 28, 1922. Serial No. 532,476.

This invention relates to an inductance coil attachment for use inconnection with any electrical circuit in which' inductance coils areemployed, but which is especially adapted for use in connection with awireless receiving or transmitting system.

The object of the invention is to provide an attachment of this naturewhich is exceedingly simple in construction, efficient in `operation andeconomical of manufacture.

A further object of the invention is to provide an attachment which, dueto its simplicity of construction and the combination of coils employedin connection therewith, renders its use for the purposes set forthexceedingly simple and expedient and enables a most ready attachment andmanipulation when used in connection with its associated circuits andinstrumentalities.

A further object of the invention is to provide a unit assemblyespecially adapted for. use in connection with what has now become knownin the art as the Growen inductance coil mounting unit.

Further objects ofthe invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination,location and relative arrangement of parts, all as will be more fullyhereinafter set forth, as shown in the accompanying drawings and finallypointed out in the appended claims. Referring. to the drawings:

Figure 1 is a plan view of the attachment of my invention, showing thesame in operative position with reference to a standard form ofreceptacle or mounting therefor.

Fig. 2 is a view in side elevation of the same, partially sectioned.

Fig. 8 isla view in front elevation of the same, partially sectioned.

Fig. 4L isa plan view of the same in horizontal section.

Fig. 5 is a similar view, largely diagrammatic, to-illustrate the wiringconnection employed.

Fig. 6 isa diagrammatic view showing the wirin' employed in myattachment.

The same part is designatedv by the same reference character wherever itoccurs throughout the several views.

A radioreceiving station responsive to all wave lengths necessarilyrequires several types of receivers for the most eflicient reception ofthe various wave lengths ranges, one type being most elicient for shortwaves and one or more other types being most efficient for Hheintermediate and longer waves. rlhe usual practice, particularly in theamateur station is to use a triple coil plug mounting, holding three ofa variety of, and interchangeable, plugged coils of various inductancevalues to permit reception on all ranges of wave lengths. Thisarrangement has proven satisfactory and efficient on wave lengths fromapproximately 600 meters to 25,00() meters, inclusive, but isinetlicient for reception on the range of wave lengths below (300meters. This type of coil mounting, while illustrated herein, and willbe briefly described, is the standard structure and in itself forms nopart of my present invention except when used in connection with theunit of my invention. The standard structure of mountinor isillustrated, for example, in Letters latent No. 1,365,170, grantedJanuary 11, 1921, to R. F. Gowen. lVhen it is desired to receive wavelengths lower than G00 meters efflciently, it is generally necessary forthe operator to resort to purchasing or building a special instrumentfor short wave reception so'thathe has at least two distinct andseparate equipments for efficient reception on all waves.

One of the objects of my invention, when practiced in connection withradio communication, is to eliminate the necessity of the completeadditional short wave instrument by making use of the triple coilmounting for short waves, and having, instead of three separate pluggedinductance coils (for example, as illustrated in the Gowen patenthereinabove referred to) a distinctly different and eflicient short waveunit adapted to be insertedy as a unit in their stead.

In accordance with my invention I provide an economical arrangement ofnecessary inductances in combination with a multi-plug contactor topermit its use in circuit with the conventional duo-lateral or honeycombtype of triple coil mounting, and'` at the same time produce anefficient coordinating element which is comparatively simple andinexpensive in construction and so designed and applied as to renderbulky and more costly apparatus, usually necessitated, unnecessary.

1 accomplish the objects of my invention by providing an inductan'cecoil in the electrical field of force in which is located two smallerinductanccs each capable of being` revolved in variometer fashion withrespec to the outer inductance, with or without energy transferrencerelationship between the two revolving elements and a multi-plugcontactor, having plugs and jacks electrically connected to itsrespective inductance elements. A

Referring to the drawings illustrating the invention, and particularlyas shown in Figs. l, 2 and 3, I have shown the table or upright type ofcoil mounting as illustrative. In this arrangement the mountingvconsists of a baseboard l on which is mounted a suitable frame 2generally containing three sets ofplug and ack blocks generallydesignated at a. One of the blocks, usually the intermediate one, isstationary and the two side blocks are mounted on shafts 5 one end ofwhich meshes with a gear 7 mounted on shaft 8 and controlled by arotatable handle 9. This is the one standard type of mounting shown anddescribed more in detail in the Gowen patent, above referred to` and initself forms no part of my present invention. Of course, in connectionwith this type of mounting terminal posts l0 are provided for completionof the electrical circuit, in which coils are included. Itl iscustomary, with this type of mounting, to employ honeycomb coilsprovided with a block containing a plug and jackconnected rer spectivelyto the terminals of the coils,

which plug and jack complete electrical circuit with the plug and jackof the mounting hereinbefore described. By means of the handles 9operation with the coupling between the respective coils is easily andindependently obtained. As hereinbefore briefly stated, to enableoperating on various wave lengths it is necessary in this type ofmounting, which is universally used, to havev coils of varying values oflnductance. The

unit of my invention is especially applicable to this type of mountingand renders the same efficient for wave lengths shorter than 60()meters; and while, therefore, I do not desire to be limited orrestricted tothis particular type of mounting, I have nevertheless,shown my invention as applied thereto, l

as one instance of its utility.

In accordance with my invention, I employ a body structure 20 which Ifind preferably to be in the form of a cylinder and of insulatingmaterial. Secured to this body structure at the front thereof, andgenerally designed to give the same rigidity Yand strength, is a frontpiece 2l, and at the back thereof is a bracket structure 22. lVhile I donot desire to be limited or restricted in this respect, I prefer to formthe bracket structure 22 of hard insulating material such as wood,rubber, bakelite or the like. The

bracket structure 22 in effect forms the block of the unit of myinvention and contains therein three plugs in alignment with each other,the plugs and jacks being so aligned and positioned as to cooperaterespectively with the plugs and jacks of the mounting piece on frame 2.IVound on the exterior of the body 20, and preferably in two sections,although in series, is one inductance size or shape of variometer coilemplo ed.

and have, therefore, merely illustrate a standard type of variometercoil, and show the same revoluble. The variometer coils 25a and 25) aremounted on shafts 26a and 26 respectively which are controlled by meansof knobs or handles 27 at the front of theV attachment. The handle 27may have secured thereto a graduated plate 28, if desired, to indicatevisibly ythe adjustment given the variometer relative to a fixed pointon the frame 21. The rear end of shafts 2GLL and 26') of the variometersare provided with pigtail connections 29L and 29D respectively to theplug and jack 30, 31,'respectively of the block 22. lith thisconstruction, it will readily be seen that either of the variometercoils may be rotated relative to each other, or the fixed coil 23, andthereby effect a fine adjustment of tuning. f

Of course, itl is necessary to provide means for limiting the rotationof the shafts to prevent breakingv the pigtail connections between theends of the coil thereof and the plug and jack 30 and 31 thereof. Anystandard means may be employed for this purpose, and I do not desire tobe limited or restricted to any specific t-ype thereof.

It will be seen from the foregoing that I have provided an exceedinglysimple and eliicient unit which, as a unit, may be inserted in thestandard type of mounting, and with this single attachment, asdistinguished from an entirely different equipment, I am enabled toobtain variometer adjustment and therefore enable the use thereof inconnection with short Wave lengths such as of the order of less than 600meters. In addition thereto it will be apparent that I have provided aunit for short wave lengths which in itself is a highly efficientstructure and which may be manufactured in varying sizes for mostefficient tuning, irrespective of wave length. Likewise, .while it isspecifically adaptable to the standard type of mounting of the plug andjack` type, it is not necessarily, however, limited thereto, and may bemounted, as desired, irrespective of the honeycomb coil mounting setforth.

Many modifications and changes in de tails will readily occur to thoseskilled in the art Without departingfrom the spirit and scope ot myinvention as delined in the claims 5 but having now set Jforth theobjects and nature of my invention and having` shown and described astructure embodying the principles thereof, what I claim as new anduseful and of my own invention, and desire to secure by Letters Patent,is:

l. An inductance coil structure comprising a supporting body, a pair oitspaced inductance coils supported thereby on parallel axes, a iXed coilalso supported by said body and positioned intermediate the inductancecoils, and provided with portions inductively associated with saidinductance coils, a block also carried by said body, and plug and jackterminals for all of said coils carried by said block.

2. :in inductance coil structure comprising a supporting body, aplurality of coils supported Within said body on diainetrical axes ofsaid` body, a stationary coil wound around said body, and inductivelyassociated with said plurality of coils, a block also carried by saidbody, and plug` and jack terminals for all of said coils carried by saidblock.

ln testimony whereof I have hereunto set my hand on this 27th day ofDecember, ifi. D. 1921.

HERBERT BRGNN PEARSON.

